GORMAN-RUPP PUMPS SE2D3 User manual

OM-06494-01
August 11, 2011
Rev. A 12‐13‐12
THE GORMAN‐RUPP COMPANY MANSFIELD, OHIO
GORMAN‐RUPP OF CANADA LIMITED ST. THOMAS, ONTARIO, CANADA Printed in U.S.A.
www.grpumps.com
2011 The Gorman‐Rupp Company
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
WITH PARTS LIST
SE SERIES PUMP
MODEL
SE2D3 115V 1P

Register your new
Gorman‐Rupp pump online at
www.grpumps.com
Valid serial number and e‐mail address required.
RECORD YOUR PUMP MODEL AND SERIAL NUMBER
Please record your pump model and serial number in the
spaces provided below. Your Gorman‐Rupp distributor
needs this information when you require parts or service.
Pump Model:
Serial Number:

TABLE OF CONTENTS
i
INTRODUCTION PAGE I - 1.................................................
SAFETY ‐ SECTION A PAGE A - 1............................................
INSTALLATION - SECTION B PAGE B - 1....................................
GENERAL INFORMATION PAGE B - 1..................................................
PREINSTALLATION INSPECTION PAGE B - 1............................................
PUMP SEAL PAGE B - 1..............................................................
LUBRICATION PAGE B - 1.............................................................
PUMP INSTALLATION PAGE B - 2......................................................
Pump Motor Specifications PAGE B - 2..............................................
Pump Dimensions PAGE B - 2.....................................................
Lifting PAGE B - 2.................................................................
Positioning the Pump PAGE B - 2...................................................
Piping PAGE B - 3................................................................
ELECTRICAL CONNECTIONS PAGE B - 3...............................................
Grounding Methods PAGE B - 4....................................................
Pump Power Cable Connections PAGE B - 5.........................................
Control Box PAGE B - 5...........................................................
OPERATION - SECTION C PAGE C - 1......................................
GENERAL INFORMATION PAGE C - 1..................................................
Pump Performance PAGE C - 1.....................................................
Pump Controls PAGE C - 1........................................................
PUMP OPERATION PAGE C - 2........................................................
Impeller Rotation PAGE C - 2.......................................................
STARTING, STOPPING, AND OPERATIONAL CHECKS PAGE C - 3.........................
Starting And Stopping PAGE C - 3..................................................
Operational Checks PAGE C - 3....................................................
LIQUID LEVEL PAGE C - 4............................................................
COLD WEATHER PRESERVATION PAGE C - 4...........................................
LUBRICATION PAGE C - 4.............................................................
Draining Oil PAGE C - 4...........................................................
Condition Of Oil PAGE C - 5........................................................
Adding Oil PAGE C - 5............................................................
TROUBLESHOOTING - SECTION D PAGE D - 1..............................
ELECTRICAL TESTING PAGE D - 2.....................................................
Test Equipment PAGE D - 2........................................................
Voltage Imbalance PAGE D - 3.....................................................
Motor And Motor Power Cable Continuity PAGE D - 3.................................
Insulation Resistance PAGE D - 3...................................................
Capacitor PAGE D - 4.............................................................
Wiring Diagram PAGE D - 4........................................................
PUMP MAINTENANCE AND REPAIR ‐ SECTION E PAGE E - 1.................
STANDARD PERFORMANCE CURVE PAGE E - 1........................................
PUMP MODEL S2D3 115V 1P PARTS LIST PAGE E - 3...................................
PUMP AND SEAL DISASSEMBLY AND REASSEMBLY PAGE E - 4.........................

TABLE OF CONTENTS
(continued)
ii
PUMP END DISASSEMBLY PAGE E - 4.................................................
Strainer And Impeller Cover Removal PAGE E - 5.....................................
Draining Oil From Seal Cavity PAGE E - 5............................................
Positioning Pump For Disassembly PAGE E - 5.......................................
Impeller Removal PAGE E - 5......................................................
Seal Removal PAGE E - 5..........................................................
PUMP END REASSEMBLY PAGE E - 6..................................................
Cleaning And Inspection Of Pump Parts PAGE E - 6..................................
Seal Installation PAGE E - 6........................................................
Impeller Installation PAGE E - 8.....................................................
Impeller Clearance PAGE E - 8.....................................................
Strainer Installation PAGE E - 8....................................................
MOTOR DISASSEMBLY PAGE E - 9....................................................
Head And Power Cable Removal PAGE E - 9.........................................
Rotor And Shaft Removal PAGE E - 10...............................................
Bearing Removal PAGE E - 10.......................................................
Centrifugal Switch Actuator Removal PAGE E - 10.....................................
Stator Removal PAGE E - 10........................................................
MOTOR REASSEMBLY PAGE E - 11.....................................................
Stator Installation PAGE E - 11......................................................
Centrifugal Switch Actuator Installation PAGE E - 12...................................
Bearing Installation PAGE E - 12.....................................................
Rotor And Shaft Installation PAGE E - 12.............................................
Head And Power Cable Installation PAGE E - 12.......................................
VACUUM/PRESSURE TESTING PAGE E - 14.............................................
LUBRICATION PAGE E - 14.............................................................
Seal Cavity PAGE E - 14............................................................
Motor Cavity PAGE E - 15...........................................................

SE SERIES OM-06494
PAGE I - 1INTRODUCTION
INTRODUCTION
Thank You for purchasing a Gorman‐Rupp pump.
Read this manual carefully to learn how to safely
install and operate your pump. Failure to do so
could result in personal injury or damage to the
pump.
This is an SE Series submersible pump. The basic
material of construction is cast iron, with stainless
steel hardware and fittings. The pump is light
weight and portable, making it ideally suited to
many domestic and industrial applications where
low capacity dewatering or irrigation is required.
The pump is powered by an integral, thermally‐
protected electric motor which is not explosion‐
proof. The pump may be operated fully or partially
submerged. Do not operate the pump in a hazard
ous atmosphere.
All repairs to the pump motor must be performed
by a Gorman‐Rupp authorized submersible repair
facility or the factory. Any repairs to the motor as
sembly performed by the customer or an unautho
rized repair facility negates the warranty.
Because pump installations are seldom identical,
this manual cannot possibly provide detailed in
structions and precautions for every aspect of
each specific application. Therefore, it is the re
sponsibility of the owner/installer of the pump to
ensure that applications not addressed in this
manual are performed only after establishing that
neither operator safety nor pump integrity are com
promised by the installation. Pumps and related
equipment must be installed and operated ac
cording to all national, local and industry stan
dards.
If there are any questions regarding the pump or
its application which are not covered in this man
ual or in other literature accompanying this unit,
please contact your Gorman‐Rupp distributor, or
The Gorman‐Rupp Company:
The Gorman‐Rupp Company
P.O. Box 1217
Mansfield, Ohio 44901-1217
Phone: [phone]
or:
Gorman‐Rupp of Canada Limited
70 Burwell Road
St. Thomas, Ontario N5P 3R7
Phone: [phone]
The following are used to alert maintenance per
sonnel to procedures which require special atten
tion, to those which could damage equipment, and
to those which could be dangerous to personnel:
Immediate hazards which WILL result in
severe personal injury or death. These
instructions describe the procedure re
quired and the injury which will result
from failure to follow the procedure.
Hazards or unsafe practices which
COULD result in severe personal injury
or death. These instructions describe
the procedure required and the injury
which could result from failure to follow
the procedure.
Hazards or unsafe practices which COULD
result in minor personal injury or product
or property damage. These instructions
describe the requirements and the possi
ble damage which could result from failure
to follow the procedure.
NOTE
Instructions to aid in installation, operation, and
maintenance or which clarify a procedure.

SE SERIES OM-06494
SAFETY PAGE A - 1
SAFETY - SECTION A
This information applies to SE Series
submersible motor driven pumps.
Because pump installations are seldom
identical, this manual cannot possibly
provide detailed instructions and pre
cautions for each specific application.
Therefore, it is the owner/installer's re
sponsibility to ensure that applications
not addressed in this manual are per
formed only after establishing that nei
ther operator safety nor pump integrity
are compromised by the installation.
Before attempting to open or service the
pump:
1. Familiarize yourself with this man
ual.
2. Make certain the control box or
switch is in the OFF or STOP posi
tion, or that the power supply to the
control box has been otherwise cut
off and locked out to ensure that
the pump will remain inoperative.
3. Allow the pump to completely cool
if overheated.
5. Close the discharge valve (if
used).
This pump is not designed to pump vol
atile, explosive, or flammable materials.
Do not attempt to pump any liquids for
which you pump is not approved, or
which may damage the pump or endan
ger personnel as a result of pump fail
ure. Consult the factory for specific ap
plication data.
If the power cable is wired into an op
tional manual starting switch or control
box, make sure that the enclosure is
grounded. See Section B for recom
mended grounds.
The electrical power used to operate
this pump is high enough to cause inju
ry or death. Make certain the control box
or switch is in the OFF or STOP position,
or that the power supply to the control
box has been otherwise cut off and
locked out. Tag electrical circuits to pre
vent accidental start‐up.
The electrical power used to operate
this pump is high enough to cause inju
ry or death. Obtain the services of a
qualified electrician to make all electri
cal connections.
Never attempt to alter the length or re
pair any power cable with a splice. The
pump motor and cable must be com
pletely waterproof. Injury or death may
result from alterations.
All electrical connections must be in ac
cordance with The National Electric
Code and all local codes. If there is a

OM-06494 SE SERIES
PAGE A - 2 SAFETY
conflict between the instructions pro
vided and N.E.C. Specifications, N.E.C.
Specifications shall take precedence.
All electrical equipment supplied with
this pump was in conformance with
N.E.C. requirements in effect on the
date of manufacture. Failure to follow
applicable specifications, or substitu
tion of electrical parts not supplied or
approved by the manufacturer, can re
sult in severe injury or death and void
warranty.
After the pump has been installed, make
certain that the pump and all piping or
hose connections are secure before op
eration.
Obtain the services of a qualified elec
trician to troubleshoot, test and/or ser
vice the electrical components of this
pump.
Do not attempt to lift the pump by the
motor power cable or discharge hose.
Attach proper lifting equipment to the
lifting device fitted to the pump.
Pumps and related equipment must be
installed and operated according to all na
tional, local and industry standards.

OM-06494 SE SERIES
PAGE B - 1INSTALLATION
INSTALLATION - SECTION B
GENERAL INFORMATION
Review all SAFETY information in Section A.
Since pump installations are seldom identical, this
section is intended only to summarize general rec
ommendations and practices required to inspect,
position, and arrange the pump and piping. If there
are any questions concerning your specific instal
lation, contact your Gorman‐Rupp distributor or
the Gorman‐Rupp Company.
Nuts, bolts and screws used on this pump
are metric and do not match standard SAE
measurement threads. If any threaded
hardware is replaced, it must be replaced
with metric type. Attempting to force in a
fastener with SAE threads will damage the
mating threads. An optional discharge
adaptor is available to convert the metric
pipe threads in the discharge flange to the
SAE threads.
PREINSTALLATION INSPECTION
The pump assembly was inspected and tested be
fore shipment from the factory. Before installation,
check for damage which may have occurred dur
ing shipment. Check as follows:
a. Inspect the pump assembly for cracks, dents,
damaged threads, and other obvious dam
age.
b. Check for and tighten loose attaching hard
ware. Since gaskets tend to shrink after dry
ing, check for and tighten loose hardware at
the mating surfaces.
c. Inspect the power cable for cuts or any other
obvious damage.
d. Check that amperes, phase, voltage and
hertz indicated on the name plate match the
ratings on the control box and incoming pow
er.
e. Carefully read all tags, decals, and markings
on the pump, and perform all duties indicated.
f. Check for oil leaks. If there is any indication of
an oil leak, see LUBRICATION at the end of
this manual.
g. If the pump has been stored for more than 12
months, some of the components or lubri
cants may have exceeded their maximum
shelf life. These must be inspected or re
placed to ensure maximum pump service.
If the maximum shelf life has been exceed, or if
anything appears to be abnormal, contact
your Gorman‐Rupp distributor or the factory
to determine the repair or updating policy. Do
not put the pump into service until appropri
ate action has been taken.
PUMP SEAL
The pump is equipped with a single faced seal as
sembly. It is designed to prevent the liquid being
pumped from entering the lubrication cavity at the
impeller end. A lip seal is used to prevent moisture
or lubrication oil from entering the motor housing
cavity at the motor end.
The seal is lubricated by premium quality submers
ible pump oil.
LUBRICATION
The pump utilizes one lubrication cavity, located
between the pump casing and the motor housing.
It is filled with premium quality submersible pump
oil which lubricates the pump seal. The motor oper
ates in and is cooled by air, therefore it requires no
lubrication.
This pump was fully lubricated when shipped from
the factory. However, lubrication levels must be
checked before installing the pump (see LU
BRICATION in the MAINTENANCE AND REPAIR
MANUAL). If the oil level is abnormally low, deter
mine the cause before putting the pump into ser
vice.
Refer to Table B‐2 for the oil capacity and position
for filling the seal cavity in the pump. Refer to LU
BRICATION, Section C for lubrication specifica
tions and intervals.

SE SERIES OM-06494
PAGE B - 2 INSTALLATION
PUMP INSTALLATION
Pump Motor Specifications
See Tables B‐1 and B‐2 for pump specifications.
Table B‐1. Pump Specifications
Liquid
Level
Control
Locked
Rotor
Amperes
Pump
HP/
KW
Motor
Speed
(RPM)
Full
Load
Amperes
No
Load
Amperes
Discharge
Size
(NPT)
Model Voltage/
Phase
SE2D3 115/1 NO 8.6 1.0 50.61 HP 3450
2 INCH
w/BARBED
ADAPTOR
Table B‐2. Additional Specifications
Pump
Model
Voltage/
Phase
115/1SE2D3
Approximate
Weight - Lbs. (kg) Oil Capacity
Ounces (Liters)
Seal Cavity
Filling
Position
(H)orizontal
Pump 50 Ft. Cable Seal
Cavity
Motor
Cavity
78 (42) 6 (3) 7 (0,2) HORIZONTAL
---
When installing or servicing the pump
or controls, follow all requirements for
the installation of wiring or electrical
equipment as outlined in the National
Electric Code. Follow all safety require
ments. Failure to observe these require
ments could result in injury or death to
personnel.
NOTE
Refer to the performance curve in Section E, Main
tenance and Repair when determining the most
efficient piping installation. The recommended
maximum submergence depth is 23 feet. Great
er depths could result in damage to the pump
Pump Dimensions
For the approximate physical dimensions of your
pump, refer to the pump specification data sheet
or contact your Gorman‐Rupp distributor or the
Gorman‐Rupp Company.
Lifting
Pump unit weights will vary depending on the
mounting and drive provided. Check the shipping
tag on the unit packaging for the actual weight, and
use lifting equipment with appropriate capacity.
Drain the pump and remove all customer‐installed
equipment such as suction and discharge hoses
or piping before attempting to lift existing, installed
units.
Do not attempt to lift the pump by the
motor power cable or the piping. Attach
proper lifting equipment or a rope to the
lifting device fitted to the pump.
Positioning the Pump
The pump is designed to operate fully or partially
submerged. The rotating parts are oil lubricated,
and the motor is cooled by a constant flow of liquid
or air discharged through internal passages.
The pump will operate if positioned on its side, but
this is not recommended because the motor
torque could cause the pump to roll during opera
tion.

OM-06494 SE SERIES
PAGE B - 3INSTALLATION
The pump should be independently secured and
supported by the lifting device fitted on the pump.
If the application involves a lot of debris, protect the
pump from excessive wear and clogging by sus
pending it in a perforated barrel or culvert pipe. If
the bottom is heavily sludge‐covered, rest the
pump on support blocks or suspend it from a raft
or similar device near the surface of the liquid. See
Figure B‐1 for typical pump installations.
All liquid entering the pump must pass through a
strainer screen. Any spherical solids which pass
through the screen will pass through the pump.
BY BAIL IN PERFORATED CULVERT PIPE ON SUPPORTS
Figure B‐1. Typical Pump Installations
Piping
No suction piping is required in a standard installa
tion. This pump is provided with a suction strainer
to prevent large solids from clogging the impeller.
To determine the size of the discharge connection,
see Table B‐1. Either hose or rigid pipe may be
used. To facilitate mobility and maintenance, it is
recommended that the discharge line be fitted with
a quick disconnect fitting near the pump. The dis
charge line must be independently supported to
avoid strain and vibration on the pump.
Either hose or rigid pipe may be used to make dis
charge connections. For maximum pumping ca
pacity, keep the line as short and straight as pos
sible. Elbows and fittings used in discharge lines
increase friction loss, minimize their use.
It is recommended that a check valve or throttling
valve be installed in the discharge line to control si
phoning or back flow when the pump is shut off.
ELECTRICAL CONNECTIONS
Install and operate this pump in accor
dance with the National Electrical Code
and all local codes. Have a qualified
electrician perform all checks and con
nections in this section.
Never attempt to alter the length of the
pump motor cable or to repair it with a
splice. The power cable and pump mo
tor must be kept completely waterproof.
Serious damage to the pump and injury

SE SERIES OM-06494
PAGE B - 4 INSTALLATION
or death to personnel can result from
any alteration to the cable.
Field Wiring Connections (Incoming Power)
The pump is designed to operate with a 115 volt,
1 phase, 60 hertz power supply. The voltage avail
able at the motor must be within the range indi
cated in Table B‐3.
To calculate the voltage available at the motor, pro
ceed as follows:
a. Measure the voltage while the pump is oper
ating at full capacity. See wiring diagrams at
the end of this section.
b. Next, subtract the motor cable voltage drop
(see Table B‐5, Pump Power Cable Specifi
cations).
c. Do not continue to operate the pump if this
voltage is not within the recommended limits.
Obtain the services of a qualified electrician to
determine the correct field wiring size and oth
er details to ensure an adequate voltage sup
ply to the pump.
Table B‐3. Pump Voltage Requirements
NOMINAL
VOLTAGE PHASE
MINIMUM
VOLTAGE
MAXIMUM
VOLTAGE
1115 110 120
Grounding Methods
If the power cable will be wired into an optional
manual switch or control box, ground the enclo
sure before installing the wiring. In any of these
cases, the electrical circuit must be grounded to a
properly imbedded electrode.
The material used for the electrode must be an ex
cellent conductor of electricity, such as copper. If
iron or steel is used, it must be galvanized or other
wise metal plated to resist corrosion. Do not coat
the electrode with any material of poor conductiv
ity, such as paint or plastic.
The electrode must conform to the recommenda
tions of N.E.C. ARTICLE 250. Follow all installation
requirements of the N.E.C., and all applicable local
codes. See Figure B‐2 for some suggested
grounding methods.
ROCK
8 FEET
(2,4 M)
3/4 INCH (19,1
MM) NOMINAL
DIAMETER
(MINIMUM)
3/4 INCH (19,1 MM)
NOMINAL DIAMETER
(MINIMUM) 8 FEET
(2,4 M) LONG
SOIL
SOIL
SOIL
1/4 INCH (6,4 MM)
STEEL PLATE 2 SQ.
FEET (1858,1 SQ. CM)
SURFACE AREA
(MINIMUM)
a) PLATE ELECTRODE b) DRIVEN ELECTRODE c) BURIED ELECTRODE
Figure B‐2. Suggested Grounding Methods
a. Plate Electrode: An iron or steel plate, 1/4
inch (6,4 mm) thick, completely impeded in
the ground. The plate must present a surface
area of at least 2 square feet (1858,1 sq. cm.).
b. Driven Electrode: A rod or pipe, 3/4 inch
(19,1 mm) in diameter minimum, 8 feet (2,4 m)
long, completely driven into the ground.
c. Buried electrode: If rock or stone prevents
embedding the full 8 foot (2,4 m) length of the
ground rod, bury it horizontally in a trench.
Space the ground rod or plates at least 6 feet
(1,8) from any other electrode or ground rod,
such as those used for signal circuits, radio
grounds, lightning rods, etc.

OM-06494 SE SERIES
PAGE B - 5INSTALLATION
The earth surrounding the ground rod or plate
must contain enough moisture to make a
good electrical connection. In dry or sandy
areas, pour water around the rod, or consult
qualified personnel to devise a method of im
proving the connections.
The electrical power used to operate
this pump is high enough to cause inju
ry or death. Make certain that the recep
tacle or optional enclosure is properly
grounded after installation.
Pump Power Cable Connections
The electrical power used to operate
this pump is high enough to cause inju
ry or death. Obtain the services of a
qualified electrician to make all electri
cal connections. Make certain that the
pump and receptacle or optional enclo
sure are properly grounded.
The pump is provided with a 50 ft. (15,2 m) power
cable (see Table B‐4 for standard power cable
specifications) with one end wired into the pump
head. The other end terminates in separate leads
which must be connected to a control box or switch
box.
Optional rainproof starting switches are available
from the factory (see the parts list, Section E).
NOTE
The optional rainproof starting switch listed in the
Parts List is not designed to be watertight and must
not be used in submerged applications.
Splicing of the power cable is not recommended
by the Gorman‐Rupp Company due to safety and
warranty considerations. If a longer power cable is
required, it should be of continuous length and
should replace the existing cable. Any replace
ment cable must be to Gorman‐Rupp standards,
and must be approved by Gorman‐Rupp.
Never attempt to alter the length or re
pair any power cable with a splice. The
pump motor and cable must be com
pletely waterproof. Injury or death may
result from alternations.
Table B‐4. Pump Power Cable Specifications
Pump
Model
Voltage/
Phase
115/1
A.W.G
Cable
Size
Conductor
Dia.
Inches
(mm)
DC
Resistance
(ohms) at
225_C (77_F)
per 1000 ft.
(305 m)
Cable
O.D.
Inches
(mm)
Amp
Rating
(See
Note
Below)
Cable
Type
Voltage
Drop
per 100 ft.
(30,5m) at
Max. Load
16 13* SO 7.72SE2D3 0.43 (11) 0.06 (1,5) 4.49
When necessary to change or connect the pump
power cable to a control box, make certain the in
coming power is OFF and LOCKED OUT. Make
certain the control box is PROPERLY GROUNDED
and that the electrical data on the control matches
the motor name plate data.
Connect the pump power cable to the control
switch as shown in the wiring diagram at the end
of this section. Make certain that all connections
are tight and that cable entry points are rainproof.
Control Box
Any control box used to operate the

SE SERIES OM-06494
PAGE B - 6 INSTALLATION
pump must be approved by the Gor
man‐Rupp Company for the application.
Motor Cable Grounding Test
Do not connect the pump control cable
to the control box or incoming voltage
before verifying the pump ground;
otherwise, personnel will be exposed to
serious injury or death.
Using a volt‐ohm meter, connect one lead to the
motor cable green/yellow ground lead. Connect
the other lead to an uninsulated point on the pump
body. The test circuit should close.
If the test circuit does not close, there is a defect in
the cable or motor which must be corrected.
Liquid Level Devices
The pump may be controlled to perform filling and
dewatering as shown in Figure B‐3 by using the
float switch and liquid level control offered as op
tions.
Overheating will occur if the liquid level falls
below the level required to cool the pump
motor (see LIQUID LEVEL in Operation,
Section C).
PUMP
CONTROL BOX
LIQUID LEVEL
RANGE
ON (FILLING)
TO LEVEL CONTROL CIRCUIT
IN MAIN CONTROL BOX
BULB (FLOAT TYPE)
OFF
DEWATERING
Figure B‐3. Typical Float Switch Installation

SE SERIES OM-06494
PAGE C - 1OPERATION
OPERATION - SECTION C
GENERAL INFORMATION
Review all SAFETY information in Section A.
This pump is designed to handle most
non‐volatile, non‐flammable liquids. Do
not attempt to pump any liquids for
which your pump is not approved, or
which may damage the pump or endan
ger personnel as a result of pump fail
ure. Consult the factory for specific ap
plication data.
The pump motor and optional accesso
ries are not designed to be explosion‐
proof. Do not operate in an explosive at
mosphere.
Follow the instructions on all tags, labels and de
cals attached to the pump.
Pump Performance
Since operation of the pump motor is de
pendent upon the quality and performance
of the electrical controls, the pump warran
ty is valid only when controls have been
specified or provided by The Gorman‐
Rupp Company.
Refer to the pump performance curve on page E‐1
for the specific performance for your pump.
Pump Controls
The pump is driven by an integral 115 VAC, 60
hertz, 1 phase motor equipped with thermal motor
overheat protection.
If the pump is wired to an optional manual starting
switch, the toggle switch within the rainproof en
closure will start and stop the pump.
If the pump power cable is wired into an optional
automatic liquid level control box, pump operation
is controlled by a selector switch. In the OFF posi
tion the switch prevents all operations of the pump.
In the HAND position, it allows the pump to run
continuously. In the AUTO position, it allows the
pump to be controlled automatically by an optional
liquid level device installed in the sump or wet well
(see Liquid Level Devices in Section B).
Short circuit protection for the optional control box
is provided by a customer‐furnished fuse or break
er within the circuit. If the breaker trips repeatedly,
operational problems exists. See TROUBLE
SHOOTING, Section D.
The pump motor and control box are not
designed to be explosion‐proof. Do not
operate in an explosive atmosphere. Im
proper location of a non‐explosion
proof control box could result in de
struction of equipment, injury or death
to personnel.
See the operating instructions furnished with the
control box and with other optional accessories
and controls before attempting to start the pump.

OM-06494 SE SERIES
PAGE C - 2 OPERATION
PUMP OPERATION
Liquid Temperature and Overheating.
Overheated pumps can cause severe
burns and injury. If the pump becomes
overheated:
1. Stop the pump immediately.
2. Make certain the control box or
switch is in the OFF or STOP posi
tion, or that the power supply to the
control box has been otherwise cut
off and locked out to ensure that
the pump will remain inoperative.
3. Allow the pump to completely cool
if overheated.
4. Close the discharge valve (if
used).
5. Refer to instructions in this manual
before restarting the pump.
Do not start the pump more than 6 times
per hour. If the motor does not cool be
tween starts it will overheat, resulting in
damage to the motor windings.
The maximum liquid temperature for this pump is
120F (49C). Do not apply it at a higher operating
temperature.
Overheating can occur if the pump is made to start
and stop repeatedly without time to cool off be
tween starts, the liquid level is allowed to fall too
low to sufficiently cool the motor, or if the circuit
breaker or fuse fails to provide adequate protec
tion. Operating the pump against a closed dis
charge valve for an extended period will also cause
the pump to overheat.
Approach the pump cautiously after it
has been running. Although the motor is
cooled by the liquid being pumped, nor
mal operating temperatures can be high
enough to cause burns. The tempera
ture will be especially high if operated
against a closed discharge valve. Never
operate against a closed discharge
valve for long periods of time.
If overheating does occur, stop the pump immedi
ately and allow it to cool before servicing it. Ap
proach any overheated pump cautiously.
Overheated pumps can cause severe
burns and injuries. If overheating of the
pump occurs:
1. Stop the pump immediately.
2. Ventilate the area.
3. Allow the pump to completely cool.
4. Check the temperature before ser
vicing.
5. Vent the pump slowly and cau
tiously
6. Refer to instructions in this manual
before restarting the pump.
Impeller Rotation
Check impeller rotation as follows before operation
to ensure that the impeller is rotating in the correct
direction.
While checking impeller rotation, secure
the pump to prevent the power cable from
coiling.
Suspend the pump from the lifting device fitted on
the pump.

SE SERIES OM-06494
PAGE C - 3OPERATION
As viewed from the top, the pump should kick in a
counterclockwise direction; this will indicate that
impeller rotation is correct.
If the pump kicks in a clockwise direction, impeller
rotation is incorrect and the pump must be re
turned to the factory or a Gorman‐Rupp authorized
Submersible Repair Center. Since the pump is
powered by a single‐phase motor, the direction of
rotation can not be altered by interchanging motor
leads at the control box.
DIRECTION OF
KICKBACK
AT STARTUP
Figure C‐1. Checking Pump Rotation
STARTING, STOPPING, AND
OPERATIONAL CHECKS
Starting And Stopping
If an optional control box is used, follow the instruc
tions accompanying the control box, start the
pump, and run any recommended checks.
After the pump has been installed in a wet well so
that it is fully submerged, start the pump as follows.
If wired into an optional manual switch, trip the
switch within the rainproof enclosure to start or
stop the pump.
If the pump is wired into an optional automatic liq
uid level control box, set the control box selector
switch to HAND; the pump will continue to run until
the switch returned to OFF, or reset to AUTO.
If desired to operate the pump in the automatic
mode, set the selector switch to AUTO; pump op
eration will be controlled by the optional float
switch. To terminate automatic mode, move the se
lector switch to OFF or HAND.
Moving the control box selector switch to
OFF does not terminate incoming power
through the field wiring connected to the
control box.
It is recommended that a check valve or throttling
valve be installed in the discharge line if there is any
possibility of siphoning or back flow when the
pump is shut off.
Operational Checks
Check the pump for proper operation when first
started and periodically thereafter to identify minor
problems.
Check the pump for unusual noises or excessive
vibration while it is operating. If noise or vibration
is excessive, stop the pump and refer to the trou
bleshooting chart for possible causes.
Check the pump strainer screen for clogging
caused by stones, sticks, or other debris. Clean
the strainer screen when required. In some cases,
stopping the pump momentarily may back flush
the strainer screen, purging most of the debris
from it. If this fails to clean the screen, remove the
pump from the sump and remove the debris manu
ally. See PUMP DISASSEMBLY in the Mainte
nance And Repair manual.
Never introduce air or steam pressure

OM-06494 SE SERIES
PAGE C - 4 OPERATION
into the pump casing to remove a block
age. This could result in personal injury
or damage to the equipment. If back
flushing is absolutely necessary, limit
liquid pressure input to 50% of the maxi
mum permissible operating pressure
shown in the pump performance curve
(refer to the accompanying Parts List
Manual).
Check the pump for overheating. Overheating can
occur if the pump is made to start and stop repeat
edly without time to cool off between starts, the liq
uid level is allowed to fall too low to sufficiently cool
the motor, or if the circuit breaker or fuse fails to
provide adequate protection. Operating the pump
against a closed discharge valve for an extended
period will also cause the pump to overheat.
Check the oil level(s) as indicated in the following
LUBRICATION section.
LIQUID LEVEL
Overheating will occur if the liquid falls be
low the level required to cool the pump mo
tor.
The pump will operate fully or partially submerged.
However, since the motor is cooled by the liquid
being pumped, overheating will occur if the liquid
is pumped below the required to cool the motor.
Models operated manually or with an optional liq
uid level device must remain sufficiently sub
merged. Do not allow the liquid level to fall below
the top of the barbed discharge adaptor in order to
provide sufficient cooling to the motor.
COLD WEATHER PRESERVATION
Do not attempt to thaw the pump by us
ing a torch or other source of flame. This
could damage gaskets, O‐rings or heat
the oil in the seal housing above critical
temperatures, causing the pump to rup
ture or explode.
The pump will not freeze as long as the casing is
submerged in liquid. If the casing is not sub
merged, or if the liquid begins to freeze, remove the
pump from the sump or wet well and dry it thor
oughly. Run the pump for two or three minutes to
dry the inner walls.
If the pump does freeze while it is out of the liquid,
submerge it until thawed; if the liquid is near freez
ing, the pump must be submerged for an extended
period of time. Check thawing by starting the pump
and checking that the shaft rotates freely. If the
pump remains frozen, allow additional thawing
time before attempting to restart.
If submerging does not thaw the pump, move it
into a warm area until completely thawed.
LUBRICATION
Do not remove plates, covers, gauges,
pipe plugs or fittings from an over
heated pump. Vapor pressure within the
pump can cause parts being disen
gaged to be ejected with great force. Al
low the pump to completely cool before
servicing.
On a new pump, check the oil level in the seal cav
ity before initial startup. Drain and replace the oil af
ter the first 200 hours of operation. Following this,
check the oil level in the seal cavity after the first two
weeks of operation, and every month thereafter.

SE SERIES OM-06494
PAGE C - 5OPERATION
Before installing or removing the lubrication plug,
always clean the area around the plug to prevent
contamination.
Draining Oil
Refer to Section E, Maintenance and Repair for
drain plug location.
It is not necessary to drain the oil from the seal cav
ity unless the pump casing will be separated from
the motor housing.
Lay the pump horizontal on a flat work surface with
the seal cavity drain plug facing up. Remove the
drain plug slowly to release any pressure. Install a
short pipe nipple in the hole. Place a clean contain
er under the plug and roll the pump on its side to
drain the seal housing.
Condition Of Oil
Check the condition of the oil drained from the
pump. Clear oil indicates that the pump seal is
functioning properly. If the oil is milky or contains
a small amount of water, it must be changed.
If the oil contains a large amount of water, it must
be changed, and the seal must be checked before
the pump is put back in operation (refer to Section
E, Maintenance and Repair).
Adding Oil
Refer to Table B‐2 in INSTALLATION for pump oil
capacities.
The grade of lubricant used is critical to the opera
tion of this pump. Use SAE No. 10 non‐detergent
oil. Oil must be stored in a clean, tightly closed con
tainer in a reasonably dry environment.
When lubricating the seal cavity, remove the lu
brication plug as indicated in Draining Oil. Add the
non‐detergent oil through this plug hole. With the
pump positioned horizontally, sight down the plug
hole and check that the oil level is high enough to
cover the seal spring.
Install and tighten the lubrication plug.

OM-06494SE SERIES
TROUBLESHOOTING PAGE D - 1
TROUBLESHOOTING - SECTION D
Review all SAFETY information in Section A.
The following precautions should be
taken before attempting to service the
pump; otherwise, injury or death could
result.
1. Familiarize yourself with this man
ual.
2. Make certain the control box or
switch is in the OFF or STOP posi
tion, or that the power supply to the
control box has been otherwise cut
off and locked out to ensure that
the pump will remain inoperative.
3. Allow the pump to completely cool
if overheated.
4. Check the temperature before
opening any covers, plates or
plugs.
5. Close the discharge valve (if
used).
The electrical power used to operate
this pump is high enough to cause inju
ry or death. Obtain the services of a qu
alified electrician to troubleshoot, test
and/or service the electrical compo
nents of this pump.
NOTE
Many of the probable remedies listed below re
quire use of electrical test instruments; for specific
procedures, see ELECTRICAL TESTING following
the chart.
Table 1. Trouble Shooting Chart
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PUMP FAILS TO START,
OVERLOAD UNIT NOT
TRIPPED
(MANUAL MODE)
Power source incompatible with
pump motor.
No voltage at line side of power cable
connection.
Open circuit in motor windings or
power cable.
Defective motor.
Correct power source.
Check power source for blown fuse,
open breaker, broken lead, or loose
connection.
Check continuity.
Check for and replace defective unit.
OVERLOAD UNIT TRIPS Low or high voltage, or excessive
voltage drop between pump and
control box.
Defective insulation in motor wind
ings or power cable; defective wind
ings.
Impeller jammed due to debris or
insufficient clearance.
Bearing(s) frozen.
Measure voltage at control box.
Check that wiring is correct type,
size, and length. (See Field Wiring
Connections, Section B).
Check insulation resistance; check
continuity.
Disassemble pump and check im
peller.
Disassemble pump and check
bearing(s).

SE SERIES OM-06494
TROUBLESHOOTINGPAGE D - 2
Table 1. Trouble Shooting Chart (cont.)
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
MOTOR RUNS, BUT
PUMP FAILS TO
DELIVER RATED
DISCHARGE
Discharge head too high.
Low or incorrect voltage.
Discharge throttling valve partially
closed; check valve installed im
properly.
Discharge line clogged or re
stricted; hose kinked.
Liquid being pumped too thick.
Strainer screen or impeller clogged.
Insufficient liquid in sump or tank.
Worn impeller vanes; excessive im
peller clearance.
Reduce head.
Measure control box voltage, both
when pump is running and when
shut‐off.
Open discharge valve fully; check
piping installation.
Check discharge lines; straighten
hose.
Dilute liquid if possible.
Clear clog(s). Stop pump; back flow
may flush away debris.
Stop pump until liquid level rises.
Check impeller and clearance. See
PUMP END REASSEMBLY.
PUMP RUNS WITH
EXCESSIVE NOISE OR
VIBRATION
Pumping entrained air.
Damaged or unbalanced impeller.
Discharge piping not properly sup
ported.
Impeller jammed or loose.
Motor shaft or bearings defective.
Pump cavitation.
Check liquid level in sump; check
position of pump and liquid level
sensing device(s).
Replace impeller.
Check piping installation.
Check impeller.
Disassemble pump and check mo
tor and bearings.
Reduce discharge head, or restrict
flow on low head applications.
ELECTRICAL TESTING
If you suspect that pump malfunctions are caused
by defects in the motor, power cable or control box,
perform the following checks to help isolate the de
fective part.
Obtain the services of a qualified elec
trician to troubleshoot, test and/or ser
vice the electrical components of this
pump.
Be certain to refer to the wiring diagram(s)
in the Installation Operations manual be
fore reconnecting any electrical compo
nents which have been disconnected.
Test Equipment
A volt/amp/ohmmeter and megohmeter of ade
quate range and quality will be required to conduct
the following electrical tests. The suggested equip